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 * Copyright (c) 2023, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package com.oracle.svm.core.graal.llvm.image;

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Scanner;

import com.oracle.svm.core.traits.BuiltinTraits.BuildtimeAccessOnly;
import com.oracle.svm.core.traits.BuiltinTraits.NoLayeredCallbacks;
import com.oracle.svm.core.traits.SingletonLayeredInstallationKind.Disallowed;
import com.oracle.svm.core.traits.SingletonTraits;
import com.oracle.svm.core.util.UserError;
import com.oracle.svm.core.util.VMError;
import com.oracle.svm.hosted.c.codegen.CCompilerInvoker;
import com.oracle.svm.hosted.image.LLVMToolchain;

@SingletonTraits(access = BuildtimeAccessOnly.class, layeredCallbacks = NoLayeredCallbacks.class, layeredInstallationKind = Disallowed.class)
public class LLVMCCompilerInvoker extends CCompilerInvoker {

    public LLVMCCompilerInvoker(Path tempDirectory) {
        super(tempDirectory);
    }

    @Override
    protected void verify() {
        if (!Files.exists(getCCompilerPath())) {
            throw UserError.abort(
                            "GraalVM needs to be rebuilt to include the LLVM toolchain. For instructions, please see https://github.com/oracle/graal/blob/master/docs/reference-manual/native-image/LLVMBackend.md.");
        }
    }

    @Override
    public CompilerInfo createCompilerInfo(Path compilerPath, Scanner scanner) {
        if (scanner.findInLine("clang version ") != null) {
            scanner.useDelimiter("[. -]");
            int major = scanner.nextInt();
            int minor0 = scanner.nextInt();
            int minor1 = scanner.nextInt();
            String[] triplet = guessTargetTriplet(scanner);
            return new CompilerInfo(compilerPath, "graalvm.llvm", "GraalVM bundled Clang C++ Compiler", "clang", major, minor0, minor1, triplet[0]);
        } else {
            throw VMError.shouldNotReachHere("The LLVM toolchain is not accessible.");
        }
    }

    @Override
    protected String getDefaultCompiler() {
        return "clang";
    }

    @Override
    public Path getCCompilerPath() {
        return LLVMToolchain.getLLVMBinDir().resolve(getDefaultCompiler()).toAbsolutePath();
    }
}
